the chinese did that in southern china. many places around the world have had malaria problems-- brazil-- that they've brought under control. not so in africa. eradication efforts are erratic. yellow fever is another mosquito-transmitted virus that the french encountered when they occupied west africa. so the way the french dealt with this was to conduct an ongoing every-four-year campaign to vaccinate every person in every country they occupied. they had groups of doctors and nurses--that's all they did. they just went from village to village on this four year cycle. that way, the most that could happen is you'd have a group of susceptible children, but it would never get very big before you'd be through vaccinating the next time around. that way, they kept yellow fever under control. now, when those countries became independent, there wasn't money for those programs. and i got introduced to yellow fever in africa because, in 1965... some seven or eight years after senegal got its independence, there was a big epidemic of